panelling a surface like these one

i have these surface that i make with rhino and is a join of many several surfaces, i have tried to make a boxmorph in grasshopper to apply a triangular pattern to all the serface but, my first prblem is that grasshopper does not get the surface as just one surfaces, grasshopper takes only one part of all the surface, i ve tried to make it as if it would be a brep o a geometry but i just do not get it, could anyone show give me a definition that could work? i would like to make it in grasshopper, i know there a panelling tools aplication in rhino but i would prefer to do it in grasshopper